The Blue Jays designated right-hander Matt Waldron for assignment on August 19, ending a stint that lasted barely three weeks after Toronto claimed him off waivers from the San Diego Padres on July 29. In a corresponding move, the club activated lefty Brendan Cellucci, who gets his first big-league opportunity after a strong run with Triple-A Buffalo.
Waldron isn't just another middle-relief arm getting cycled through a bullpen. He's one of the only pitchers in the sport still throwing a knuckleball as a real weapon, a pitch he picked up in high school in Nebraska after watching Tim Wakefield and later developed into a genuine big-league offering with San Diego. In his first full season with the Padres in 2024, he leaned on the knuckler 38% of the time, the highest rate of any MLB pitcher since 2018 -- the kind of novelty act that made him worth a flier for a Jays staff hunting length down the stretch.
It just didn't take. Waldron made 4 appearances in Toronto, opening with 2 scoreless outings before things unraveled. He surrendered 3 runs in the 9th inning against Boston on August 12, then gave up 2 more runs on 4 hits over 2 innings in his final look, against Tampa Bay on August 18. He leaves Toronto with a 10.38 ERA in blue and white.
The timing matters. The Blue Jays are in the thick of the AL wild card chase, sitting right around.500 and within a game of a playoff spot after a hot stretch. There's no patience for an experiment that isn't producing outs, and Cellucci -- a 28-year-old who posted a 3.68 ERA across 39 appearances at Buffalo this year -- represents a lower-variance option for a bullpen trying to hold steady through the final stretch.
Waldron now heads back to the waiver wire, where some other club will get to decide if the knuckleball is still worth betting on. He's been passed around twice in a month, from the Padres to the Jays and now off the roster again -- proof that even a genuinely unique pitch doesn't buy much job security once the results go sideways in a pennant race.